reading a Knock Sensor

[spidy]

If you can cut the knock board off of an old memcal you can use it to drive
a LED instead of feeding the CPU a digital sig.


----- Original Message -----
From: "Programmer" <nwester at eidnet.org>
To: <gmecm at diy-efi.org>
Sent: Tuesday, October 10, 2000 10:56 AM
Subject: Re: reading a Knock Sensor


I thought the more you "squeezed" the crystal,
the more voltage output ?
Lyndon.
-----Original Message-----
From: Roger Heflin <rah at horizon.hit.net>
To: gmecm at diy-efi.org <gmecm at diy-efi.org>
Date: October 8, 2000 9:42 PM
Subject: Re: reading a Knock Sensor


>
>
>On Sun, 8 Oct 2000, Keith wrote:
>
>> I know i can get the Voltage but what does that convert to?? more
>> voltage = more knock???
>> how much is too much.?
>> Thanks
>> Keith
>>
>It does not convert.   The knock sensor is simply a microphone,
>everything that determines if the noise is knock is in the
>electronics.
>
>Most of the electronics just do filtering and measure the amount of
>power in a certain frequencty band, and this supposely differs by
>engine and placement of the sensor(s).
>
> Roger
>
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